LSN180HEV1 User Manual

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52 | APPLICATION GUIDELINES

Single Zone Mega Wall Mounted Engineering Manual

Due to our policy of continuous product innovation, some specications may change without notication.

BUILDING VENTILATION DESIGN GUIDE

Advantages

• May be used with all single zone systems.

• The outdoor air unit may supply “neutral” air to the occupant space

even when the single zone indoor unit fan changes speed or cycles

on and off. DDOAS controls do not have to be interlocked with the

single zone system.

• In lieu of installing localized smaller outside air treatment

equipment throughout the building, this method centralizes the

ventilation air source making service and filter changes easier and

less disruptive for the building occupants.

• Third-party demand control ventilation controls are more readily

accommodated.

Disadvantages

• Ceiling space is required to accommodate ductwork between the

centralized outdoor air unit and ceiling diffusers.

LG recommends using the DDOAS method in all installations.

Ceiling Diffuser

Outdoor Air Unit / ERV

Outdoor Air

Wall Mount Inverter

Intake Grill

Figure 21: Decoupled Dedicated Outdoor System Diagram

Methodology illustrations are for examples only and do not depict actual

indoor units for the specic outdoor unit pairing. These are generic illus-

trations to show ventilation design only.

Building Ventilation Design Guide

ASHRAE 62.1 and local codes specify the minimum volume of outdoor air that must be provided to an occupied space. Outdoor air is

required to minimize adverse health effects, and it provides acceptable indoor air quality for building occupants. The three methods of ac-

complishing this with single zone systems are summarized here.

Method 1: Decoupled Dedicated Outdoor Air System (DDOAS)

Provide a separate, dedicated outdoor-air system designed to filter, condition, and dehumidify ventilation air and deliver it directly to the

conditioned space through a separate register or grille. This approach requires a separate independent ventilation duct system not associ-

ated with single zone systems (Figure 21).

Although we believe that these building ventilation methods have been portrayed accurately, none of the methods have been tested, veried, or

evaluated by LG Electronics, U.S.A., Inc., In all cases, the designer, installer, and contractor should understand if the suggested method is used, it

is used at their own risk. LG Electronics U.S.A., Inc., takes no responsibility and offers no warranty, expressed or implied, in law or in fact, including

but not limited to any implied warranty of merchantability or tness for a particular purpose.

• For a complete copy of Standard 62.1-2010, refer to the American Standard of Heating and Air Conditioning Engineers (ASHRAE)

website at www.ashrae.org.

• For more information on how to properly size a ventilation air pretreatment system, refer to the article, “Selecting DOAS Equipment with

Reserve Capacity” by John Murphy, published in the ASHRAE Journal, April 2010.

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User Manual - Page 52